Abstract
Powdery mildew incited by Golovinomyces cichoracearum has become a serious problem on sunflower in India during the past 2–3 years. Genetic resistance in the released cultivars and the parental lines of hybrids is rather limited. Hence, screening of about 420 accessions comprising of wild Helianthus species, interspecific derivatives, core germplasm, inbred lines and few exotic accessions was done under natural field conditions for 2 years and further confirmed by screening under artificial inoculation conditions. PCR analysis using primers specific to powdery mildew causing genera gave a 391 bp band which confirmed the pathogen as G. cichoracearum. Seven different screening methods were tested which induced infection, but dusting of spores on to the healthy leaves proved to be convenient and more effective method of infection. Based on the differential response of the accessions derived from diverse genetic backgrounds, a scale for obtaining reliable estimates of the disease has been devised. Among different cultivar germplasm accessions, the disease severity index (DSI) ranged from 15 to 100 and area under disease progression curve (AUDPC) ranged from 95 to 648. Among the four groups of cultivated sunflower accessions tested, DSI and AUDPC was in the order of exotic lines < interspecific derivatives < inbred lines < core germplasm. Reliable sources of resistance to the pathogen were identified in four annual wild species (H. argophyllus, H. agrestis, H. debilis, H. praecox), six perennials (H. angustifolius, H. atrorubens, H. rigidus, H. salicifolius, H. pauciflorus and H. resinosus), two interspecific derivatives (HIR-1734-2, RES-834-3) and two exotic lines (PI 642072, EC-537925).
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Acknowledgments
The authors are grateful to Dr. T. Sreten, IFVCNS, Novisad; Dr. Laura Marek and Dr. Gerald Seiler, USDA-ARS Fargo, USA, for providing the seed material. The help of Dr. Dandapani, NAARM, Hyderabad and Dr. K. Alivelu, Directorate of Oilseeds Research for statistical analysis, and Dr. K. Karuna, Associate Professor, UAS, Bangalore for help with confirmation of the sources is gratefully acknowledged.
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Reddy, K.P., Rao, S.C., Kirti, P.B. et al. Development of a scoring scale for powdery mildew (Golovinomyces cichoracearum (DC.) V.P. Heluta) disease and identification of resistance sources in cultivated and wild sunflowers. Euphytica 190, 385–399 (2013). https://doi.org/10.1007/s10681-012-0805-y
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DOI: https://doi.org/10.1007/s10681-012-0805-y